> Aztec.nr API reference, v6.0.0 (mainnet and testnet). Index: https://docs.aztec.network/aztec-nr-api/mainnet/llms.txt

# Global DOM_SEP__MESSAGE_NULLIFIER

Module: `noir_aztec::protocol::constants`

```rust
pub global DOM_SEP__MESSAGE_NULLIFIER: u32;
```

Domain separator for L1 to L2 message nullifiers.

This is not technically a protocol constant as message nullifiers are computed by each contract.